A magnetic float sensor FSH01 (horizontal) is a type of level sensor that is used to detect the level of a liquid in a tank or container. It consists of a float that contains a magnet, and a reed switch that is mounted on the side of the tank. As the float rises or falls with the level of the liquid, it activates or deactivates the reed switch by moving the magnet closer to or farther away from the switch. The FSH01 sensor is designed to be installed in a horizontal orientation, with the float and the reed switch positioned on the same plane. The sensor is often used in applications where the liquid level needs to be monitored or controlled, such as in sump pumps, water tanks, and overflow protection systems. It is typically used with liquids that are compatible with the materials used in the sensor, and it may have a maximum operating temperature and pressure rating.